Add error badge rendering (#3)

src/ErrorImageRendererService.php

@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of GitHub Profile Views Counter.
+ *
+ * (c) Anton Komarev <anton@komarev.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Komarev\GitHubProfileViewsCounter;
+
+use Contracts\Komarev\GitHubProfileViewsCounter\InvalidPathException;
+
+final class ErrorImageRendererService
+{
+    private string $errorBadgePath;
+
+    public function __construct(string $errorBadgePath)
+    {
+        if (!file_exists($errorBadgePath)) {
+            throw new InvalidPathException('Error badge image not found');
+        }
+
+        $this->errorBadgePath = $errorBadgePath;
+    }
+
+    public function getImageWithMessage(string $message): string
+    {
+        $errorImage = file_get_contents($this->errorBadgePath);
+
+        return $this->replaceImagePlaceholders($errorImage, $message);
+    }
+
+    private function replaceImagePlaceholders(string $errorImage, string $message): string
+    {
+        $messageLength = strlen($message);
+
+        $minImageWidth = 98;
+        $minCounterBackgroundWidth = 17;
+        $minCounterTextLength = 70;
+        $minCounterTextMarginLeft = 480;
+
+        $imageWidth = $minImageWidth + (8 * $messageLength);
+        $counterBackgroundWidth = $minCounterBackgroundWidth + (8 * $messageLength);
+        $counterTextLength = $minCounterTextLength + (80 * $messageLength);
+        $counterTextMarginLeft = $minCounterTextMarginLeft + (40 * $messageLength);
+
+        $errorImage = str_replace('%MESSAGE%', $message, $errorImage);
+        $errorImage = str_replace('%IMAGE_WIDTH%', $imageWidth, $errorImage);
+        $errorImage = str_replace('%COUNTER_BACKGROUND_WIDTH%', $counterBackgroundWidth, $errorImage);
+        $errorImage = str_replace('%COUNTER_TEXT_LENGTH%', $counterTextLength, $errorImage);
+        $errorImage = str_replace('%COUNTER_TEXT_MARGIN_LEFT%', $counterTextMarginLeft, $errorImage);
+
+        return $errorImage;
+    }
+}